<template>
    <div class="component-upload-image">
        <el-upload
            ref="imageUploadRef"
            multiple
            :action="uploadImgUrl"
            list-type="picture-card"
            :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload"
            :limit="limit"
            :accept="fileAccept"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :before-remove="handleDelete"
            :show-file-list="true"
            :headers="headers"
            :file-list="fileList"
            :on-preview="handlePictureCardPreview"
            :class="{ hide: fileList.length >= limit }"
        >
            <el-icon class="avatar-uploader-icon">
                <plus />
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <div v-if="showTip" class="el-upload__tip">
            请上传
            <template v-if="fileSize">
                大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
            </template>
            的文件
        </div>

        <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
            <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
        </el-dialog>
    </div>
</template>

<script setup lang="ts">
import type { OssVO } from '@great/services';
import { systemOssService } from '@great/services';
import { globalHeaders, propTypes } from '@/utils/ruoyi';
import { compressAccurately } from 'image-conversion';
import type { ElUploadInstance, UploadFile } from '@/pages/system/system.d';
import { Plus } from '@element-plus/icons-vue';

const props = defineProps({
    modelValue: {
        type: [String, Object, Array],
        default: () => []
    },
    // 图片数量限制
    limit: propTypes.number.def(5),
    // 大小限制(MB)
    fileSize: propTypes.number.def(5),
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: propTypes.array.def(['png', 'jpg', 'jpeg']),
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
    // 是否支持压缩，默认否
    compressSupport: {
        type: Boolean,
        default: false
    },
    // 压缩目标大小，单位KB。默认300KB以上文件才压缩，并压缩至300KB以内
    compressTargetSize: propTypes.number.def(300)
});

const { proxy } = getCurrentInstance() as any;
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref<any[]>([]);
const dialogImageUrl = ref('');
const dialogVisible = ref(false);

// const baseUrl = import.meta.env.VITE_APP_BASE_API;
const baseUrl = `${RUOYI_SERVICE_BASE_URL}`;
const uploadImgUrl = ref(baseUrl + '/system/oss/upload'); // 上传的图片服务器地址
const headers = ref(globalHeaders());

const fileList = ref<any[]>([]);
const fileDataList = ref<any[]>([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

const imageUploadRef = ref<ElUploadInstance>();

// 监听 fileType 变化，更新 fileAccept
const fileAccept = computed(() => props.fileType.map(type => `.${type}`).join(','));

watch(
    () => props.modelValue,
    async (val: any) => {
        if (val) {
            // 首先将值转为数组
            let list: OssVO[] = [];
            if (Array.isArray(val)) {
                list = val as OssVO[];
            } else {
                const res = await systemOssService.listByIds(val);
                list = res.data;
            }
            // 然后将数组转为对象数组
            fileDataList.value = list.map(item => {
                // 字符串回显处理 如果此处存的是url可直接回显 如果存的是id需要调用接口查出来
                let itemData;
                if (typeof item === 'string') {
                    itemData = { name: item, url: item };
                } else {
                    // 此处name使用ossId 防止删除出现重名
                    itemData = { name: item.ossId, url: item.url, ossId: item.ossId };
                }
                return itemData;
            });
        } else {
            fileList.value = [];
            fileDataList.value = [];
            return [];
        }
    },
    { deep: true, immediate: true }
);

/** 上传前loading加载 */
const handleBeforeUpload = (file: any) => {
    let isImg = false;
    if (props.fileType.length) {
        let fileExtension = '';
        if (file.name.lastIndexOf('.') > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
        }
        isImg = props.fileType.some((type: any) => {
            if (file.type.indexOf(type) > -1) return true;
            if (fileExtension && fileExtension.indexOf(type) > -1) return true;
            return false;
        });
    } else {
        isImg = file.type.indexOf('image') > -1;
    }
    if (!isImg) {
        proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
        return false;
    }
    if (file.name.includes(',')) {
        proxy?.$modal.msgError('文件名不正确，不能包含英文逗号!');
        return false;
    }
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }

    //压缩图片，开启压缩并且大于指定的压缩大小时才压缩
    if (props.compressSupport && file.size / 1024 > props.compressTargetSize) {
        proxy?.$modal.loading('正在上传图片，请稍候...');
        number.value++;
        return compressAccurately(file, props.compressTargetSize);
    } else {
        proxy?.$modal.loading('正在上传图片，请稍候...');
        number.value++;
    }
};

// 文件个数超出
const handleExceed = () => {
    proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
    if (res.code === 200) {
        uploadList.value.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId });
        uploadedSuccessfully();
    } else {
        number.value--;
        proxy?.$modal.closeLoading();
        proxy?.$modal.msgError(res.msg);
        imageUploadRef.value?.handleRemove(file);
        uploadedSuccessfully();
    }
};

// 删除图片
const handleDelete = async (file: UploadFile): boolean => {
    if (file.response.data.ossId) {
        await systemOssService.delOss(file.response.data.ossId);
        fileDataList.value = fileDataList.value.filter(item => item.ossId !== file.response.data.ossId);
        emit('update:modelValue', listToString(fileDataList.value));
        return true;
    }
    return true;

    // const findex = fileList.value.map(f => f.name).indexOf(file.name);
    // if (findex > -1 && uploadList.value.length === number.value) {
    //     let ossId = fileList.value[findex].ossId;
    //     systemOssService.delOss(ossId);
    //     fileList.value.splice(findex, 1);
    //     emit('update:modelValue', listToString(fileList.value));
    //     return false;
    // }
    // return true;
};

// 上传结束处理
const uploadedSuccessfully = () => {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileDataList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit('update:modelValue', listToString(fileDataList.value));
        proxy?.$modal.closeLoading();
    }
};

// 上传失败
const handleUploadError = () => {
    proxy?.$modal.msgError('上传图片失败');
    proxy?.$modal.closeLoading();
};

// 预览
const handlePictureCardPreview = (file: any) => {
    dialogImageUrl.value = file.url;
    dialogVisible.value = true;
};

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
    let strs = '';
    separator = separator || ',';
    for (let i in list) {
        if (undefined !== list[i].ossId && list[i].url.indexOf('blob:') !== 0) {
            strs += list[i].ossId + separator;
        }
    }
    return strs != '' ? strs.substring(0, strs.length - 1) : '';
};
</script>

<style lang="scss" scoped>
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
    display: none;
}
</style>
